Patent GB-1527145-A (GB)
Title: Process and device for winding conical cross-wound bobbins with constant thread feed speed
IPC: B65H51/30
Filed: 1975-11-20
Abstract: 1527145 Winding conical, cross-wound bobbins W REINERS VERWALTUNGS GmbH 20 Nov 1975 [20 Nov 1974] 47778/75 Headings DID and D1J In a process for winding a conical crosswound bobbin with a constant thread feed speed, the bobbin is rotated by frictional contact with its periphery, and the different winding speeds between the large and the small bobbin diameter are compensated by the periodical filling and emptying of the thread store, the thread store being filled in the period in which the thread is guided from the neutral to the minimum bobbin circumference and back, and emptied in the period in which the thread is guided from the neutral to the max. bobbin circumference and back, the momentary value of the length of stored thread being varied in accordance with a wave function. The neutral bobbin circumference is defined as that circumference which has a peripheral speed equal to the linear speed of thread supply. Winding with variable thread store. Conical cross-wound bobbin 16, Fig. 1, is rotated by high-friction zone 15 of roller 14, and is wound with thread by guide 18 traversed by oscillating bar 17 common to a number of winding stations. A variable store of running thread is created between rollers 23, 25 by roller 24 oscillatable with lever 26 about pivot pin 56. Oscillating bar 28, also common to a number of winding stations, pivots lever 31 about pin 34 to oscillate lever 26 and roller 24. As shown, guide 18 is at a "neutral" position where the thread delivered is all wound onto the bobbin circumference and the thread stored is zero. As guide 18 is traversed to the small bobbin end and back to the "neutral" position, lever 26 is pivoted anti-clockwise to create a max. thread store. As the guide is traversed to the large bobbin end and back, lever 26 is pivoted clockwise to decrease the store to a min. Changing crossing angle of wound thread. Bars 17, 28, Fig. 3, are oscillated by a cam drum via pivoting levers 96, 103. The drum is rotated by gears 84, 87 connected by gears 90, 91. To vary the thread crossing angle, about shaft 78 by eccentric 108, the drum being thus accelerated and decelerated. gears 90, 91 are oscillated on member 86 Eccentric 109 oscillates pivoted lever 117 to move the pivot 118 of lever 103 to correspondingly vary the size of the thread store. Decreasing the thread store with increasing bobbin size. Bobbin tube 61, Fig. 4, is located by holder 63 which is pivotable about shaft 62 and which is so shaped that the pressure of the tube on roller 14 remains constant. As the bobbin grows holder 63 pivots upwards to move rod 66 downwards to rotate shaft 68 and, Fig. 5, cam 69. Lever 72 is pivoted by the cam to rotate shaft 38 and, Fig. 1, lever 35 bearing pivot pin 34 of lever 31. Thus, as the bobbin grows, the oscillating deflection of lever 26 and the thread store size is reduced. Auxiliary thread guides. The traversed thread runs over guide 39 to maintain the distance between roller 25 and the winding point constant. Guide 51 may be raised, Fig. by the upward pivoting of levers 27, 53 to lift the thread from guide 18. Simultaneously, pin 41 on lever 27 is lowered so that member 37 drops to break the connection between levers 31, 26. Roller 24 passes between rollers 23, 25 to allow for threading up.